Figure 2
From: Load emphasizes muscle effort minimization during selection of arm movement direction
An example of strokes and polar representations of corresponding directional histograms obtained from a representative subject during production of the task with the dominant (D) and nondominant (ND) arm without and with load. The histograms represented by the contours of the grey areas demonstrate the frequency of stroke production in each direction. Peaks of these histograms represent preferred directions. Quadrants I, II, III, and IV of movement directions are denoted mirror-symmetrically for the D and ND arms. The histograms are overlapped with traces representing the directional histograms of strokes optimized according to I INTE (blue), I INTS (red), I IR (green), and I E (yellow). Here and in the other histograms, 0° denotes the lateral direction away from the body midline and 90° denotes the anterior direction away from the body